Four-high rolling mill



Aug. 26; 1930. O. B. LINDQUIST 1,773,737

FOUR-HIGH ROLLING MILL Filed May 25, 1928 2 Sheets-Sheet l IN V EN TOR.

BY Au/m 7 Ala ATTORNEYS.

Aug.'26, 1930.

FOUR-HIGH ROLLING MILL o. B. LINDQUIIST 1,773,737

Filed May 25, 1928 2 Sheets-Sheet 2 IN VEN TOR.

(Q62? [7! syg gm c 'a a vdda A TTORNEYS.

Patented Aug. 26, 1930 UNITED STATES OTTO B. LINDQUIST,

NLPATENT OFFICE OF TARENTUM, PENNSYLVANIA, ASSIGNOR T0 ALLEGHENY STEEL COMPANY, A CORPORATION OF PENNSYLVANIA FOUR-HIGH ROLLING MILL Application filed May 25,

relatively large backing rolls so arranged to.

engage the reducing rolls on opposite sides thereof and in the plane including the reduclng roll axes in order to prevent undue de flection of the reducing rolls during rolling.

It is absolutely essential to maintain the axes of the backing rolls parallel to those of the reducing rolls for the reasons well known in the art, such misalignment of the axes may be caused from Wear of the backing rolls or reducing rolls and any misalignment however small would obviously be fatal.

In my application Serial No. 181,448, filed April 6, 1927, I disclosed a novel means for adjusting and positioning the axes of the associated rolls. This means was provided in connection with that type of backing roll having its ends rotatably journaled in the mill housings and it is an obj ect of this invention to provide a construction utilizing certain features of the adjusting means employed in my above application in combination with that type of backing roll termed by me as a cylindrical backing roll. The cylindrical type of backing roll is j ournaled on a stationary shaft having its ends fixed in the mill housings.

Another object of this invention is to provide a four-high mill of such construction and arrangement as to permit ready and easy adjl stment and positioning of the cooperating r'oll axes during rolling.

A further object of this invention is to provide a four-high mill having cylindrical backing rolls mounted on stationary axles and means for aligning the axes of the stationary axles with the axes of the associated working rolls.

These and other objects will be apparent 1928. Serial No. 280,453.

Figure 1 is a view in side elevation of a four-high rolling mill constructed in accordance with the invention and Fig. 2 is a similar view of the same looking from the left in Fig, 1 and particularly in section on the line IIII of Fig. 1.

lVhile this invention is shown in connection with a four-high mill, it will be understood that various features thereof are applicable to mills of other types.

The mill selected for the purpose of illustrat-ion is of the four-high type comprising roll stands or housings 11 having two relatively small reducing rolls 12 mounted in vertical movable journal boxes 13 and two relatively large backing rolls 14a of the cylindrical type mounted on stationary axles 15 by means of suitable roller bearings 16.

The stationary axles 15 are mounted in eccentric bushings 17 which are in turn mounted in vertical movable cradles 18, the

cradles being held in place in the housing by any suitable means such as shown at 19 and suitable spring means, not shown, are provided for maintaining the backing rolls and their respective working rolls in position.

Mechanism is provided for rotating the eccentric bushings 17 for the purpose of aligning the axes of the axles 15 with the axes of the working rolls 121 The mechanism forms a part of the screwed down device for the top backing roll. A similar mechanlsm 1s provided for the lower backing roll. That provided for the upper backing roll consists of the threaded rods 21 which are threaded through suitable blocks 22 mounted in the roll housings and which engage contact members 23 on the flattened top 24 of each upper bushing 17 and on opposite sides of the center of rotation thereof, so that by appl mg pressure to one contact member and re ievlng the other member from pressure, the bushings 17 will be caused to rotate about their center and thus shift the axes of the axle 15 laterally 1n the desired direction.

The screw-down shafts 21 are separately rotatable by hand through the medium of worm shafts 25 and worms 26, engaging threaded shafts 28 engaging contact members 29 mounted on the flattened bottom 31 of the lower bushing and these shafts are separately operated through separate reduction gears 32 by means of manual rotatable shafts 33.

It can be seen from the above that the stationary axles 15 can readily be adjusted so that their axes will be in the plane including the reducing roll axes. It will also be seen that should the upper backing roll for example,- from wear or any other cause, become misaligned, such misalignment can be instantly corrected even during rolling by first.

backing off one or the other of the screwdown shafts 14 and then screwing up the other shaft 14 to cause a suflicient rotation of the bushing 17 to overcome the misalignment of the roll axes.

It will beunderstood that such movement will be very small and that by means of such an adjustment, the roll axis can be maintained at all times in absolute parallelism in a common plane. 1

While I have illustrated and described but one embodiment of-this invention, it will be readily understood that certain changes, modifications, substitutions, additions and omissions may be made therein without de- 30 parting from the spirit and scope ofthe appended claims. r

What I claim as new and desire to secure by Letters Patent is:

1. The combination in a rolling mill, of a as reducing roll, a cylindrical backing roll mounted on a' stationary axle, rotatably 4. A four-high rolling mill comprising a mill housing, reducing rolls provided wlth cylindrical backing rolls ,of larger diameter mounted in saidhousing, the backing rolls being i'otatably mounted on stationary axles,

rotatable bushings in said mill housing forming journals for the ends of said axles, the surfaces of said bushings being eccentric to the axes of said axles, and mechanism on said mill housing for rotating said eccentric bushings for laterally shifting said stationary axles to align the axes thereof with the axes of the reducing rolls.

In testimony whereof, I have hereunto subscribed my name this 22nd day of May 1928.

. orro B. LiNnoUisr.

mounted bushings within which the ends of l the stationary axles are fixed the exterior the axis of said axle and means for rotating said bushings to align the axes of the stali-ltfilaly axles with the axes of the reducing ro s.

reducing roll, a cylindrical backing roll rotatably mounted on a stationary axle, rotatable bushings at the ends. of said axle, having exterior surfaces eccentric to the axis of'said axle, and screw driven mechanism for rotating said bushings to align the axis of the stationary axle with the axls of the reducing roll.

3. The combination in a four-high rolling mill, of a pair of reducing rolls, a cylindrical backing roll for each reducing roll 'rotatably' mounted on a stationary axle, rotatable bushngs forthe ends of said stationary axles havlng exterior surfaces eccentric to the axes of said axles, and mechanism for rotating said bushings for laterall'y shifting said stationary axles to align the axes thereof with the axes of said reducing rolls, said mechanism compr sing a plurality of screw-down shafts engaging the top of each bushing onopposite sides thereof and means for operating i said shafts. i

2. The combination in a rolling mill of a surface of said bushing being eccentric to 

